#: 20789 S12/OS9/68000 (OSK)
    21-Feb-95  11:38:51
Sb: #20777-IRQ Stack
Fm: David M. Horn 73260,242
To: David Breeding 72330,2051

David,

Microware sets the IRQ stack size intentionally low to get good minimum memory
numbers for marketing.  If your system has a significant amount of IRQ activity
(such as serial I/O), this number should be increased generously.  I was
working with a system that had 32 high speed intelligent serial ports, upto 28
more conventional serial ports, and lots of hard disk activity.  I think we
increased the IRQ stack to 32k long words.  OS-9 does not always report IRQ
stack problems gracefully, so increasing the IRQ stack is a good thing to try
if you can't figure out strange behavior in a complex system.

David Horn

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